Add kit selftest CI, Outline sync script, and close ops soak gaps

Fake-site Playwright suite catches BasePage/ApiClient/network regressions
before consumers pin a broken tag; Outline sync + docs for QA & Dev live page;
Pushgateway deploy soak confirmed separately on observability LXC.

selftest/playwright.config.ts

@@ -0,0 +1,29 @@
+import { defineConfig, devices } from '@playwright/test';
+
+const port = Number(process.env.PLAYKIT_SELFTEST_PORT || 4173);
+const baseURL = process.env.PLAYKIT_BASE_URL || `http://127.0.0.1:${port}`;
+
+export default defineConfig({
+  testDir: './tests',
+  fullyParallel: true,
+  forbidOnly: !!process.env.CI,
+  retries: process.env.CI ? 1 : 0,
+  workers: process.env.CI ? 2 : undefined,
+  reporter: process.env.CI ? 'list' : [['list'], ['html', { open: 'never' }]],
+  use: {
+    baseURL,
+    ...devices['Desktop Chrome'],
+    trace: 'on-first-retry',
+  },
+  webServer: {
+    command: `node demo-site/server.mjs`,
+    url: baseURL,
+    reuseExistingServer: !process.env.CI,
+    timeout: 30_000,
+    env: {
+      ...process.env,
+      PLAYKIT_SELFTEST_PORT: String(port),
+      PLAYKIT_SELFTEST_HOST: '127.0.0.1',
+    },
+  },
+});